What does the Viessmann Vitodens 050-W E387 fault code mean?
The E387 fault code indicates a malfunction with the system flow sensor in the Viessmann Vitodens 050-W boiler. This sensor is crucial for monitoring the flow of water through the heating system, and its failure can lead to inefficient heating or boiler shutdown.
Common Causes
- Faulty Flow Sensor: The flow sensor may be defective or damaged, leading to incorrect readings.
- Wiring Issues: Damaged or loose wiring connections to the flow sensor can disrupt its functionality.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional handling for safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the flow sensor is around £150 to £250, depending on the specific parts needed and labour costs. This estimate reflects the typical price for parts and professional service in the UK.